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jounce (v.)

"to jolt or shake," especially by rough riding, mid-15c., of unknown origin, perhaps a blend of jump and bounce. "Several words in -ounce, as bounce, flounce, pounce, trounce are of obscure history" [OED]. Related: Jounced; jouncing. The noun is 1787, from the verb.

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Definitions of jounce from WordNet
1
jounce (v.)
move up and down repeatedly;
Synonyms: bounce
2
jounce (n.)
a sudden jarring impact;
Synonyms: jolt / jar / shock
From wordnet.princeton.edu